Orientation-dependent X-ray Dark-field ReconstructionDark-field x-ray imaging is a novel imaging modality that
allows visualizing
small-angle scattering effects. Such images are typically
created by a
Talbot-Lau measurement setup. The method uses several
gratings to capture the
x-ray wave front that arrives at the detector. From this
data three different
information sources can be extracted: A conventional x-
ray
absorption image, a
differential phase image, and a dark-field image. The
phase-
contrast images
visualize the phase accumulated by x-rays in a material.
This causes a
deflection of the x-ray wave front. While the phase
signal
is a measure of the
large scale variation of the wave front, the dark-field
images describe the
small scale irregularity of the wave front which is
caused
by objects smaller
than the pixel size. Thus, the dark-field gives
information
on structural
variations and density fluctuation.In Germany, there are only few groups that are able to
acquire dark-field
images with the Talbot-Lau method. It is a completely new
modality and is
currently under investigation for various applications.
Reconstruction of
scalar and vectorial components in dark-filed tomography
still remains largely
unexplored. Our research focus on exploring the great
potential of dark-field
imaging. We expect that it will be beneficial for medical
imaging and
nondestructive testing in future.
| Project manager: PD Dr.-Ing. Christian Riess, Prof. Dr.-Ing. habil. Andreas Maier
Project participants: Shiyang Hu, M. Sc.
Keywords: Dark-field; Reconstruction
Duration: 1.4.2014 - 31.3.2016
Sponsored by: Erlangen Graduate School in Advanced Optical Technologies
Contact: Hu, Shiyang Phone +49 9131 85 27894, Fax +49 9131 85 27270, E-Mail: shiyang.hu@fau.de
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